2014沪教版数学四下《小数加减法》ppt课件.ppt

文档介绍：小数加减法的应用
- -
- -
= – –
= 21 –
= (米)
- -
= –( + )
= – 13
= (米)
- -
= - -
=2 -
= (升)
- -
= -
= (升)
- -
= –( + )
= –
= (升)
王大伯要耕一块950平方米的地,,,再耕多少平方米的地就可以耕完?
有三箱货物,,,,第三箱中多少千克
950 - -
= 950 - ( + )
= 950 - 760
= 190(平方米)
950 - -
= 950 - -
= -
= 190(平方米)
- -
- -
= – –
= 75 –
= (千克)
= –( + )
= – 10
= (千克)
= ( + )+( + )+( 9 + )
= 19 + 19 +
= 38 +
=
= 9× 6
9+
9+
9+
9-
9+
+++-+
= 54 + (+) + (+)-
= 54 + 1+1-
= 56-
=
= 54+( + )+
= 54+1+
= 55+
=
= ( + )+( + )+( 9 .4+ )
= 19 + 18 +
= 37 +
=
= 9× 6
9+
9+
9+
9-
9+
++++-+
= 54 + (+) +